Use of microemulsions for removal of color and dyes from textile wastewater

✍ Scribed by Tereza Neuma de Castro Dantas; Leocadia Terezinha Cordeiro Beltrame; Afonso Avelino Dantas Neto; Maria Carlenise Paiva de Alencar Moura

• Publisher: Wiley (John Wiley & Sons)
• Year: 2004
• Tongue: English
• Weight: 117 KB
• Volume: 79
• Category: Article
• ISSN: 0268-2575
• DOI: 10.1002/jctb.1034

✦ Synopsis

Abstract

One of the major environmental problems in the textile dyeing industry is the removal of color from effluents. The present study deals with color removal from effluents using microemulsions. The wastewater used in this study was the reactive exhausted dye liquor from a dyeing house containing Procion Yellow H‐E4R (CI Reactive Yellow 84), Procion Blue H‐ERD (CI Reactive Blue 160) and Procion Red H‐E3B (CI Reactive Red 120). Color removal was determined by CIE L*a*b* (CIELAB) color space, CIE L*a*b* color difference, Δ__E__*~ab~, and absorbance. Color removal greater than 95% was achieved, attaining values lower than the consent requirements established by the Environmental Agency. It was observed that pH is an important parameter in color removal and effluent pH correction from 10.44 to 9 before extraction improved results. The results obtained were modeled using the Scheffé net method and evaluated through the construction of isoresponse diagrams by correlation graphics between experimental values and those obtained through use of model equations, providing an experimental error of less than 2%. The optimized method very efficiently removed all dyes contained in the effluent. The same microemulsion phase recovered after the extraction process can be used at least a further 14 times and all the extractions gave good color removal. Copyright © 2004 Society of Chemical Industry